/*******************************************************************************
 * Copyright (c) 2012, 2013 Association for Decentralized Information Management in
 * Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.g3d.property;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import org.simantics.utils.datastructures.Arrays;

public class MethodComboValueProvider implements ComboValueProvider {

	Method getter; 
	Method setter;
	Method values;
	
	public MethodComboValueProvider(Method getter, Method setter, Method values) {
		this.getter = getter;
		this.setter = setter;
		this.values = values;
	}
	
	@Override
	public Object getValue(Object obj) throws Exception{
		if (getValueType().isEnum()) {
			Object value = getter.invoke(obj);
			Object[] vs = getValueType().getEnumConstants();
			return (Integer) Arrays.indexOf(vs, value);
		}
		else {
			return getter.invoke(obj);
		}
	}
	@Override
	public void setValue(Object obj, Object value) throws Exception {
		setter.invoke(obj,value);
	}
	
	@SuppressWarnings("unchecked")
	public List<Object> getValues(Object obj) throws Exception {
		if (values != null) {
			return (List<Object>)values.invoke(obj);
		}
		else if (getValueType().isEnum()) {
			Object[] enumConstants = getValueType().getEnumConstants();
			List<Object> result = new ArrayList<>(enumConstants.length);
			for (Object c : enumConstants)
				result.add(c);
			return result;
		}
		else {
			throw new IllegalStateException("No value list defined for " + getter.toString());
		}
	}

	@Override
	public Class<?> getValueType() {
		return getter.getReturnType();
	}
}